Offset harrow



i Jan. 24, 1933. l B, E ROSE A 1,895,136 A eeeee ts-Sheet 1 mvErToR' TTTTTT EY Jan. 24, 1933. B. IF; msi-zA 1,895,136.4

OFFSEI'LI HARROW Filed March 17A. 1930 2 Sheet- Sheet 2 INVENTon B.ERo.se

- "Q Amm,

ATTORNEY 4 Patented Jan. 24,` 1933 UNITED? STATES BRUCE E. Rosii, or ron'rnnvrLLn, CALIFORNIAY 'l orrsnr "HARBQW Application led `*March v17, 1930. Serial No. 436i,416. A

This invention relates to disc harrows of l what isknown as the offset type in which the harrows are arranged as front and rear gangs angularly disposed relative to each other in a plane transversely of the movement of 'the harrow and the draftvmeans is applied to the front harrow to one side of the longitudinal center line of the gangs. Owing to this arrangement it is very easy to steer the gangs in one direction but almost impossible to successfully steer the same in the opposite direction, asis well known to those who have used harrows of this character. It has therefore been recognized that in order to enable the harrows to vturn in said opposite direction it is necessary to jack-knife the gangs or temporarily reverse their angle so that the discs will then track in the general direction of the turn to be made. Up to this time this .20 jack-knifing of the gangs has been done by means of manually controlled devices of some kind or another, which must be actuatediat just the proper moment to obtain the desired results. y

The principal object of my invention is vto avoid the need of this manual control device by connectingrthe gangs toeach other and y to the draft arm in such a manner that any deviation oi" the tractor laterally from a straight line toward one particular side preferably the right side) automatically causes the gangs to jack-knife relative to each other soV that the discs assume positions necessary :tor them to readily turn toward that side; and so that the greater the lateral movement of the tractor the greater will be the jack-V kniing action. .At the same time the returning` of the tractor to its normal line of movement again automatically returns the gangs to their proper working` position. As a result otmy improved arrangement no attention need be given the implement by the driv-' er of the tractor and he Acan there-fore devote 'his entire attention to properly steering the machine with the knowledge that the discs are properly tracking at all times.

A further object of the invention is to pro-v duce a simple and inexpensive device and yet the purpose for which it is designed.v

one which will be exceedingly effective :forl

These objects I accomplish' by meansl of such structure and relative arrangement of parts as will fullyV appear by a perusal ofthe following specification and claims.l i

In the drawings similar characters of reference indicate corresponding' parts in theV A several views: Y

Fig. 1 isa top plan View of lmy improved oii'set harrow arrangement shown in its n ormal working position; s s

Fig. 2 is a similar'view showingthe jackkning action of the'harrow gangsy as the harrow makes a` right-hand turn. i

, Fig. 3 is afraginentary fcross section on the line 3-3 of Fig. 2L -V 35 Referring now more particularly to the characters of reference on the drai'vvings,'lv and 2 denote the transversely extending axles of the front and rear harrow/ units respectivetially the same angle and to one side of. the

Vnormal'line of draftl D. Each axleihas ai.

row of-transverselyl spaced harrowdiscs 3 mounted'thereon,the discs being disposed in reversed or opposedrelation to each other asusuah4 f fi,

` The opposite-end journal'boxes of the axlesA have rigid bars orarms 4 and 5 respectively, secured thereto, which bars extend horizontally at right angles to' the axles. The bars 4 are nearest the line of draft and the bar of theforward gang has a' draft arm 6 pivoted thereonand projecting'orwardly therefrom for swivelconnection to the draw-head Y 7 of a tractor in the customary manner. The 85 adjacent ends of Vthebars tot the two gangs are connected by a pairfofpivoted toggle links 8 while theadjacent ends of the bars 5 are connected by similar links 9. Acrossbar 10 connects the'pair's of links at theirV points of pivotal, connection with each other; the length of the bar 10 being such-that one pair of the links is practically folded or jack-. knifed while the other pair is extended, and` vice-versa. Y Since both pairs of links are substan- Y tially the same length an opposedjack-knifingand. extending action cfg-the linksl will i i dent.` Since the normal Voperating position of the harrow is when the gangs are at diverging angles to the line of draft, the links 8 will be the ones normally jack-knifed with such positioning of the gangs. The setting ofthe discs as the harrow advances along a straightline is suchthat there is no tendency for the setting of the links to be reversed, and it is of course easy lto make a left-hand turn, since the discaXles are*l more orless.

radial to the center of turning in that'direction, 'l y l Said axles however vare then obviously wrongly positioned for making a right-hand turn and their angularity must be reversed in order to place such axles substantially radialto thefcenter of a right hand 'curve or' turn if each turn is' to be properly made. With my improved harrow this is automatically accomplishedV by the` turning of the tractor, and the consequent vlateral swiveling of the draft arm 6 towardthe right bythe Y following simple means.

Pivoted in connection with the front har- J row gang substantiallycentrally of its ends is a longitiidinallyextending leverjll whichis also pivotedonto the cross bar l0 inter-v mediate the' ends ofthe same.' The Vforward Y end of this lever someV distance ahead of its pivotal connection with the front gang is pivf otallyr connected to a transversely yextending link v12.' This link has a longitudinally adjusta-bleV swivel connection with a'slee'vel, -iwhi'ch itself is mounted onthe draft arm v6 intermediate the ends of the latter for longi- Y tudinal yadjustment thereon. By reason of this connection it will be seen that when the draft arm'swings over-toward the right with the turning of the tractor in that direction,

theforward portion of thelever 11 will also immediately swing toward the-right; The

Y rear end of the lever Awhich is connected tO.V the barlO willfswing toward'the left, :push

ing the bar l() laterally relative tothe gangs and'of coursecausing the links 8 lto be eX- tended' and the llinks 9to be jackknifed.

Y This action of tliejlinks, as previouslyexplained, causes the angularity of the 4disc gangs to be reversed, placing them in positionyto properly makea right hand turnat the same time as the tractor turns, as shown in 2, Y Y e Y To cause the rear gang` to be always held in a predetermined position ielativeto the front v gang, and to also cause said rear gang to assuine the desired radial position when maka right turn, the link 8 of the rear gang hasa forward extension 8a and the lever 1l t beingpconnectedby .anfadditional linkVV 14@ This ,ities said rear 'gang link 8 to .thelever has a. rearward and Vangled.extension lla., rearwardly of its pivotalv connection with the bar 10'; the outer ends of such extensions 11 in suchfa mann-er that said link `cannot move, so as to 'allow the` rear gang to assume a dierent angular position, without alsol moving the lever ll.' The pairs of vlinks '8 y andl 9 must therefore move in a'definite 're-' lationship to each other at alltiines, thereby insuring a proper andcontinued alineinentv kof therear gang relative to the frontY gang being had, Yand irrespective lof. whether the lateral actionof' the draft arm be large or lW'hen the tractor again straightens iip,'to

resume its'straight line'pulling, the action of the'parts as above described is of course immediately reversed until the gangs reassume their normal operating positions relative to each other, the link 14 forcing ythe rear gang into'proper position.

By reason ofthe connections to each other so that thereis noV play oi'- between 'the l draft arm and the ,linkfgangs 8 and 9i the gangs are normally held immovable relative weaving therebetween. The'adjustabilityof Y the link l2 with respect to the sleeved?) enables the angiilarity of thev gangsV relative to each other to be altered without movingthe Y draft arm Vwhile the adjustment of the sleeve,

13 along the draft arm enables the angularitylof the latter and consequently the normal lateral position of the tractor relative 'to the ganga to be altered without affecting the vangular relation of thegangs.' n v From the foregoing description it'will bereadily seen that I have produced such a desuch detail may be resorted to as do notfoim a departurefrom the spirit of the invention,

as definedby the appended claims.

. Havingthus described inyinvention what I claimras new and useful and desire'to secure` by LettersPateiit is:

l. An offset harrow structure comprising front Vand rear .barrowl gangs, a draft arm` ,connected to thefrontgang, pairs of toggle links connecting the gangs on opposite sides of the harrovv, and lmeans between theY draft arm andsaid links for controlling the; foldingand extending action ofthe opposite pairs of links simultaneously with the transverse swinging movement of the draft arm.vr

2. An offset.harrowVV structure Vcomprising y tended whereby te cause the gangstofbe' angularly disposed relative to 4a line project- Vedjat right angles" to the lineiof draft, and

means'between said-bar andthedraft arm forV p moving thebar in its longitudinal plane with' Yvice as substantially fulfills the objects ofthe invention asset forth herein. yr While this specication sets forth indetail the present and Vpreferred construction of the, device. still in practice such deviations fromA iiof the swinging of the draft arm in a transverse plane.

3. An offset harrow structure comprising front and rear harrow gangs, a draft arm connected to the front gang, pairs of togglelinks connecting the gangs on opposite sides of the harrow, a bar connecting the pairs of links and arranged to cause one pair to be substantially folded while the other iseX- tended whereby to cause theA gangs to be angularly disposed relative to each other, a lever extending longitudinally of theV harrow structure. pivotedintermediate its ends onto the front `gang and at its rear end onto said bar, and a link connecting the forward 4end of said lever and the dra-ft arm intermediate its ends.

4. A structure as in claim 3, in whichthe point of connection of the last named link with the draft arm is adjustable both along the said arm and along the link.

5. A structure as in claim 2, with means between one of theV toggle-links of the rear gang and the lever to prevent movement of said link unless the lever moves also.

6. A structure as in claim 1, with means associated with said controlling means for preventing movement of one link without the other links moving simultaneously therewith and in a certain definite direction.

7. A structure as in claim 2, with a forward extension on one rear-gang toggle-link,

a rearward extension on the lever, and a linkconnecting the outer ends of said extensions.

8. An offset harrow comprising a pair of gangs in tandem normally lying ata divergent angle relative to `each other when in working position, a laterally swingable draft arm on the front gang, pairs of toggle links connecting the gangs, one pair being substantially folded and the other substantially eX- tended when the gangs are in normal working position, whereby a pull on the draft arm in one direction will act to reverse therelative folded and extended positions of the pairs of toggle links, and thus reverse the angular relation of the gangs.

9. A disc harrow comprising disc gangs in tandem, pairs of toggle links connecting the gangs at spaced points whereby the swinging of one gang horizontally will cause one pair of links to be extended and the other pair folded relative thereto, means to thus swing.

one gang, and means for maintaining the pairs of links in a predetermined relative position.

10. A disc harrow comprising disc gangs in tandem, and normally lying at a diverging angle relative to each other when in working V position, pairs of toggle links connecting the i one gang.

f the relative angle of the gangs.

211. A- disc harrow comprising lgangsnin tandem, pairs of togglev links connecting the 3fA Y gangs -on opposite sides of the harrow, means Y for controlling the folding and ,eX-tending movement of the links, and means for maintaining the pairs lof links ina predetermined relativeposition;V

1f2.` A disc liarrowi'comprising gangs inV tandem, a pair' of toggle links connecting the gangs at one lpoint and another pair of links connecting the gangs at a point spacedv from the first links whereby the `swinging of one gang will impart movementto the links to change their relative position, and means to maintain the pairs of links in iiXed relative positions. Y

13. A disc harrow comprising gangs in tandem, a pair of toggle links connecting the gangs at one point and another pair of links connecting the gangs at a point spaced from the lirst links whereby-the swinging of one gang will impart movement to the links to change their relative position, and means connecting thepairs `of links whereby movement of one pair will act on the other pairto make such relative movement positive. 1 Y 14.-. A disc harrow comprising gangs in tandem, pairs of toggle links connecting the gangs on opposite sides of the harrow, and

means for controlling the folding and extending movement of the links.

15. A disc harrow comprising YetH gangs in tandem, pairs of toggle links connectingthe gangs on opposite sides of the harrow, a draft element connected Ito the front gang whereby the harrow may be drawn along and turned to one side or the other, and means for con` trolling the folding and extending of thev links with the turningof the harrow.

Vl. A disc harrow comprising gangs .in

tandem, a draft arm connected to the front gang, pairsoftoggle rlinks connecting the V gangs on opposite sidesof'the harrow and normally disposed so thatv the gangs are posi-v tioned in diverging relation to leach other, and means acting through the links to alter 17. A disc harrow comprisingigangs in tandem, pairs of toggle links connecting the gangs on opposite sides ofthe harrow, means applied to onegang to swing the same horizontally, and means actuated by the swinging of one gang for controlling the relative extending and folding action ofl 'opposite pairs of links.

18. A disc harrow comprising gangs intandem, pairs of toggle links connectingthe gangs on opposite sides of the harrow, and normallyV disposed so that the gangs are positioned in angled relation relative to each other, means applied to one gangto swing izo the same horizontally, and means function-v ing with the swinging of one gang to actv on the links to alter the angle between the gangs. l A i 19.` A disc harrow comprising gangs v.in

' tandem, pairs of toggle linksoith'elsame length connecting thegangs on opposite sides ofthe narrow, one pair'of links being nor. mallyfolded While the other pair is extended Wherebythe gangs are then disposed at an angle to each other, means applied to one gang to swing the-same horizontally,and

means functioning With the swinging of' one gang forreversingthe setting of-thegpairs of links to, reverse the relative angularity of the gangsff` Y v 1 In testimony whereof I a-HX my signature.

- BRUCE ROSE.

hen 

